A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <ctype.h>
#include "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/asn1.h>
int i2a_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *a)
{
int i, n = 0;
static const char *h = "0123456789ABCDEF";
char buf[2];
if (a == NULL)
return (0);
if (a->type & V_ASN1_NEG) {
if (BIO_write(bp, "-", 1) != 1)
goto err;
n = 1;
}
if (a->length == 0) {
if (BIO_write(bp, "00", 2) != 2)
goto err;
n += 2;
} else {
for (i = 0; i < a->length; i++) {
if ((i != 0) && (i % 35 == 0)) {
if (BIO_write(bp, "\\\n", 2) != 2)
goto err;
n += 2;
}
buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
if (BIO_write(bp, buf, 2) != 2)
goto err;
n += 2;
}
}
return (n);
err:
return (-1);
}
int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
{
int i, j, k, m, n, again, bufsize;
unsigned char *s = NULL, *sp;
unsigned char *bufp;
int num = 0, slen = 0, first = 1;
bs->type = V_ASN1_INTEGER;
bufsize = BIO_gets(bp, buf, size);
for (;;) {
if (bufsize < 1)
goto err;
i = bufsize;
if (buf[i - 1] == '\n')
buf[--i] = '\0';
if (i == 0)
goto err;
if (buf[i - 1] == '\r')
buf[--i] = '\0';
if (i == 0)
goto err;
again = (buf[i - 1] == '\\');
for (j = 0; j < i; j++) {
#ifndef CHARSET_EBCDIC
if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
((buf[j] >= 'a') && (buf[j] <= 'f')) ||
((buf[j] >= 'A') && (buf[j] <= 'F'))))
#else
/*
* This #ifdef is not strictly necessary, since the characters
* A...F a...f 0...9 are contiguous (yes, even in EBCDIC - but
* not the whole alphabet). Nevertheless, isxdigit() is faster.
*/
if (!isxdigit(buf[j]))
#endif
{
i = j;
break;
}
}
buf[i] = '\0';
/*
* We have now cleared all the crap off the end of the line
*/
if (i < 2)
goto err;
bufp = (unsigned char *)buf;
if (first) {
first = 0;
if ((bufp[0] == '0') && (buf[1] == '0')) {
bufp += 2;
i -= 2;
}
}
k = 0;
i -= again;
if (i % 2 != 0) {
ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_ODD_NUMBER_OF_CHARS);
return 0;
}
i /= 2;
if (num + i > slen) {
sp = OPENSSL_clear_realloc(s, slen, num + i * 2);
if (sp == NULL) {
ASN1err(ASN1_F_A2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
OPENSSL_free(s);
return 0;
}
s = sp;
slen = num + i * 2;
}
for (j = 0; j < i; j++, k += 2) {
for (n = 0; n < 2; n++) {
m = OPENSSL_hexchar2int(bufp[k + n]);
if (m < 0) {
ASN1err(ASN1_F_A2I_ASN1_INTEGER,
ASN1_R_NON_HEX_CHARACTERS);
goto err;
}
s[num + j] <<= 4;
s[num + j] |= m;
}
}
num += i;
if (again)
bufsize = BIO_gets(bp, buf, size);
else
break;
}
bs->length = num;
bs->data = s;
return 1;
err:
ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_SHORT_LINE);
return 0;
}
int i2a_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *a)
{
return i2a_ASN1_INTEGER(bp, a);
}
int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
{
int rv = a2i_ASN1_INTEGER(bp, bs, buf, size);
if (rv == 1)
bs->type = V_ASN1_INTEGER | (bs->type & V_ASN1_NEG);
return rv;
}